Apparatus for discharging press-boxes in hydraulic presses.



W. G. GROTHB APPARATUS FOR DISCHARGING PRESS BOXES IN HYDRAULIC PRESSES.

APPLICATION FILED MAY 24, 1916. mmwmm I Patented Apr. 23,1918.

2 SHEETS-SHEET I.

Arr/V.

w. G GROTHE. APPARATUS FOR DISCHARGING PRESS BOXES IN HYDRAULIC PRESSES.

APPLICATION FILED MAY 24.1916,

Patented Apr. 23, 1918.

2 SHEETS-SHEET 2.

p r in WILHELM GUSTAV GROTI-IE, 0F WEESP, NETHERLANDS, ASSIGNOR T0 C. J'. VAN HOUTEN & ZOON, 0F WEI-ESP, NETHERLANDS.

APPARATUS FOR DISCHARGING PRESS-BQXES IN HYDRAULIC PRESSES.

incense.

Specification of Letters Batons.

Patented Apr. 23, I91.

Application filed May 24, 1916. SerialNo. 99,669.

description of the invention, such as willenable others skilled inthe art to which it appertains to make and use the same.

The present invention relates to an apparatus for discharging press boxes in by draulic presses and has for its object to effect the discharging of the pressed cakes more rapidly and more easily than was posble with prior constructions.

In known presses with press boxes one half of the number of press boxes is subject to pressure while the others are being emptied or filled. For the purpose of discharging, a strap is brought under the press box, which strap rests with its ends on the frame. By means of a screw-threaded spindle arranged vertically in this strap, which spindle carries at its upper end a dished plate, by actuation of a hand crank, if desired, through the intermediary of a suitable transmission gear, the freely supported base eration involves a waste of time and in addi tion is rather fatiguing, because the strap is fairly heavy and the cakes areoften very firmly bedded in the boxes. In addition, with heated presses the temperature of the press and the vicinity of the press is very high which renders inconvenient operation among the press boxes.

These disadvantages are avoided by the present invention the novelty of which consists in the feature that beneath each of the boxes, which are slid or swung to one side after thepressing operation and superposed, lifting arms are rotated and thereafter the lifting arms are simultaneously and mechanically or hydraulically raised and the pressed cakes liftedfrom the boxes.

thatthe spindles with thelifting arms may be raised a distance corresponding to the height the pressed cake is to be lifted.

In the use of so-called double sided presses in which after a pressing operation the boxes are alternately slid or swung to one side and the'other,and thereupon freshly filled boxes are slid or swung from the op posite side into the press chamber, the construction may be such that on both sides two groups of lifting arms can be brought into operative position, in which position they can be brought under the press boxes just slid or swung out of the press chamber.

The spindles with the lifting arms are so arranged on the side of the press that the arms can be turned completely out of the service space to be occupied by the operator and such space can be left free for the operator.

In the accompanying drawing is illustrated apparatus constructed in accordance with the present invention.

Figure 1 shows assembled a complete press with lifting devices; Fig. 2 is a vertical section of the press in a plane parallel to the picture plane in Fig. 1 with the press boxes partly in elevation and partly in section, with the pressure-head at the upper end in elevation. Fig. 3 is a horizontal section of a press above one of the pressing tables. Fig. 4 an elevation of the lower part of one of the spindles showing two lifting arms and distance rings partly in section. Fig. 5 is a plan of the apparatus shown in Fig. 4:.

The press shown in the drawing is adapt ed to be used for the removal of oil from cacao. This press is of the vertical type and the pressing chamber 2". 6., the chamber, where in the pressing operation the superposed press boxes with the pressed tables between the same are located, is provided at the lower end with a hydraulic cylinder 1 anda ram 2 and with a pressure-head 3 at the upper end. The cylinder and head are connected by means of columns 4.

5, 6, 7 and 8 denote four cast iron frames of which two are located at each side of the press, parallel to one another, and all of which are secured to thehead 3 at the upper end and to the cylinder 1 at the lower end. On opposed sides of each frame are cast ledges with horizontal grooves 9. The boxes which are denoted by the numeral 10 are provided with ledges 11 adapted to engage the grooves 9. The grooves 9 are spaced equally apart and opposite each groove in one frame is a groove in the adjacent frame so that when the boxes are slid outward the boxes track the grooves 9 and are prevented from movement in upward direction.

-For the purpose of supporting the boxes when they are located in the press chamber and thus out of operative relation with the grooves 9, there arecast on the lower sideof the tables 12, between which the boxes are located in the pressing operation, ledges 14 which, on movement of the boxes into the pressing chamber, are each located at the same level as the part of the ledge below a groove 9 so that when the ledges on the boxes leave the grooves 9 they bear on the ledges lfl. The boxes 10 are thus suspended as itwere on the tables 12. The tables 12 are guided during the pressing operation on the columns 4;, as will be understood from consideration of Fig. 3.

The boxes 10 have perforated base plates 15 (Fig. 2) on each base is located a filter plate 16 on which is laid the material 17 to be pressed; this material is again covered by a filter plate 18 and a perforated cover plate 19.

The pressing operation is effected by the rise of the ram 2, the cylindrical upper portion of the same and the cylindrical lugs on the tables 12 engaging the boxes and pressing the-material therein. The butter flows through the perforations in the base plate 15 and the cover plate 19 and finally all that remains in each box pressed cake. 7

The cacao press shown in the drawings has twelve boxes 10 of which six are in the pressing chamber proper, the other boxes are located alternately to the right and left thereof. \Vhenthe boxes slid to the side are emptied and the pressing of the material in the other boxes has been effected, the latterwill be moved aside to be discharged, that is, will be moved alternately to the left and to the right outside the pressing chamis a socalled her, while the other boxes will be brought into operative position. I e

For thepurpose of easy and speedy discharge there are provided two vertical spindles 20 and 21 mounted one on each side of the press adjacent to the frames 5 and 6 (Fig. 3).. These spindles, are supported at the lower end in fixed bushes 22, being supported in the lowest position by the collar 23 and prevented from rotation by means of the groove and feather 24. At the upper end each of the spindles is suspended in a fixed frame 25 by means of a hydraulic lifting device 26 and a hook which engages an eye on the spindle. On each spindle are mounted six rotatable or oscillatory arms 27, which arms are spaced apart by means of distance pieces 28.

The dimensions of the arms 27 and the position of the spindles 20 and 21 are such that the free end of each of these arms can be rotated exactly beneath one of the press boxes which has been slid to one side out of the press chamber for discharge. The operative position is shown at the right in Fig. 1 and in Fig. 5 in chain-dotted lines; in Fig. 2 there are shown at the right three boxes which have been slid to the side with the lifting arms thereunder. The free end of each arm is provided with a plate 29 (Fig. 4:) which plate comes into position with the plane surface beneath the perforated base plate 15 of the box when the arm is located in operative position.

The spindles can be raised by the hydraulic lifting device 26 and assume the position shown at the left in Fig. 2. By the lifting of the spindles the plates 29 come first into contact with the base-plate 15 and on being further lifted raise the plates 15 and also the pressed mass.

- The stroke is such that after the completion of the lifting operation the cakes are raised so far out of the boxes that they can be easily removed.

Thereafter the spindles are again lowered and fresh charges placed in the empty boxes. In the meantime the charges in the boxes located in the pressing chamber are pressed and the latter replaced by the boxes which have just been filled, such charged boxes being moved toward the center while the boxes in which the mass has been pressed assume the position in which they are filled. The lifting arms which have just effected their operation are in the interval swung to the side and now the intermediate arms are swung below the filled press boxes which are in turn duly discharged.

The means for lifting out the cakes in accordance with this invention can be adapted to existing presses in suitable manner without the necessity for altering the press itself. Also it is to benoted that the above described means can be used for lifting the cakes and for pressing in ap )aratus in which the boxes are, not slidable but are mounted to swing about a vertical axis.

lVhat I claim and desire. to secure by Letters Patent of the United States of America 1. Apparatus for discharging boxes in hydraulic presses, comprising a vertical spindle, arms mounted for oscillatory movement on said spindle, and means for lifting said spindle and therewith said arms.

2. In a hydraulic press, in combination, boxes movable from within the press to dis charging position outside the press, a vertical spindle alongside the press, arms mounted for oscillatory movement on said spindle, said arms provided with lifting members adapted, when the arms are oscillated in one direction, to assume a position beneath the boxes when in discharging position, and means for lifting said spindle and therewith said arms to discharge the boxes.

3. In a hydraulic press, in combination, a series of boxes movable from within the press to the exterior of the same and on opposite sides for discharging two vertical spindles, one on each side of the press, arms mounted for oscillatory movement on said spindle, said arms provided with lifting members adapted to assume a position beneath the boxes when in discharging position, and means for lifting said spindles and therewith said arms to discharge the boxes.

4. In a hydraulic press, in combination, a series of boxes movable outwardly from within the press to opposite sides of the same, vertical spindles contained in a vertical plane exterior to the press, arms mounted for oscillatory movement on said spindles and means for lifting said spindles and therewith said arms.

5. Apparatus for discharging boxes in hydraulic presses comprising arms mounted for oscillatory movementin a substantially horizontal plane, and means for lifting said arms.

In testimony whereof I aflix my signature in presence of two witnesses.

VVILHELM GUSTAV GROTHE.

Witnesses H. F. JORRETIME, A. C. NELSON.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patenta. Washington, D. 0. 

